How did everyone else get the red wire in if it is so tightly screwed in? I can’t seem to get it to budge, even with the correct size screwdriver.

I used a small flathead that fit in the slot. Then used pliers on the shaft of the screwdriver. I used the pliers to turn the screwdriver and I was able to loosen the screw

Where can I find an owners manual?

Jeezus people, if the person is asking isn’t it obvious he does not have it in the box?!! The least helpful answers ever. I inherited the thermostat from a previous owner and in search for a manual, too. Guess what— no box!!

How do I put it on. I cannot program it

Hi, thank you for reaching out with this. We would like to gather some more information on your specific system so that we can provide assistance on how to program. Please reach out to our support team on Facebook/Twitter with a private message. We look forward to hearing from you soon. -Jim

does this thermostat use a battery for power? and how long should the battery last if it needs one

Hi there, this thermostat requires 2 AAA batteries, battery life depends on the usage, we recommend replacing batteries at least every year. - Maria

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Honeywell Home RTH221B1039 RTH221B Programmable Thermostat, White

Honeywell Home RTH221B1039 RTH221B Programmable Thermostat, White

Product ID: 27042208

Details

Brand
Honeywell Home
Controller Type
Hand Control
Model Name
RTH221B
Product Dimensions
1"D x 4.75"W x
Special Feature
Clock Display

⏰1-week programmable schedule

🔋Battery change reminders

🌡️±1°F precise temperature control

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

¥11062

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Description

🌡️ Stay in control, save energy, and never miss a beat with Honeywell’s smart simplicity!

SMART REMINDERS MEMORY - Never miss a battery change with built-in alerts, plus your settings stay saved even during power outages, keeping your comfort uninterrupted.
DIY FRIENDLY INSTALLATION - Get up and running quickly with straightforward, step-by-step instructions—no need to wait for a technician or disrupt your schedule.
INTUITIVE DIGITAL INTERFACE - Navigate settings easily with a crisp, easy-to-read digital display and one-touch controls designed for busy professionals.
EFFORTLESS WEEKLY SCHEDULING - Set one consistent program for all 7 days with 4 customizable periods—wake, leave, return, and sleep—so your home’s comfort adapts seamlessly to your lifestyle.
PINPOINT TEMPERATURE ACCURACY - Maintain your ideal climate with precision control within ±1°F, ensuring energy efficiency without sacrificing comfort.

The Honeywell Home RTH221B1039 is a sleek, white programmable thermostat designed for precise temperature control with ±1°F accuracy. It offers a one-week programmable schedule with four daily periods, an easy-to-read digital display, and simple DIY installation. Battery change reminders and memory retention during power outages ensure hassle-free operation. Compatible with most heating and cooling systems (excluding electric baseboard and multi-stage setups), it’s a reliable, energy-saving solution for modern homes.

Specifications

ASIN	B018A3DHJY
Additional Features	Clock Display, Low Battery Indicator, Low Voltage, Programmable
Backlight	Yes
Best Sellers Rank	#37,278 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #56 in Home Programmable Thermostats
Brand Name	Honeywell Home
Color	White
Connectivity Technology	Non-connected
Control Method	Touch
Control Type	Button Control
Controller Type	Hand Control
Customer Reviews	4.3 4.3 out of 5 stars (7,770)
Display Type	Digital
Finish Types	White
Global Trade Identification Number	00085267348553
Included Components	Mounting Hardware, Thermostat, User Manual
Item Dimensions D x W x H	1"D x 4.75"W x 3.5"H
Item Type Name	Programmable Thermostat
Manufacturer	Honeywell
Manufacturer Part Number	RTH221B
Manufacturer Warranty Description	1 year limited.
Material Type	Plastic
Model Name	RTH221B
Model Number	RTH221B1039
Mounting Type	Wall Mount
Number of Batteries	2 AA batteries required.
Power Source	Battery Powered
Product Style	Contemporary
Shape	Curved
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	Air Conditioner, Furnace
Specification Met	energy
Temperature Control Type	Heating and Cooling
UPC	085267348553
Voltage	24 Volts

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

¥11062

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews